That used to work perfectly on 6.48.7

Now on RB4011 with 7.10 it simply does not. All config was re-created from scratch, using an existing export as help

Both unis config for this part are identical

I have main LAN on ether2 (192.168.88.0/24)
ether1 is direct connection to DSL modem (bridge mode, has accessible own LAN port on 192.168.2.10)
ether1 IP 192.168.2.1

I have ip routing in place: dst add 192.168.2.10/32 gw ether1
From Mikrotik I can ping 192.168.2.10
But from the attached client (192.168.88.98) I cannot

As I said, used to work fine, just not on RouterOS 7.xx

Any ideas what changed & what I have missing?

sebus

You don't need explicit route, setting ether1 address with appropriate subnet mask is enough. However, you very likely need a SRC-NAT rule (of some kind) to make traffic towards DSL modem coming from MT LAN to appear as if it's coming from MT. Because DSL modem most probably knows nothing about 192.168.88.0/24 and need for using MT as gateway (so return traffic is lost). How exactly this would look like depends on how exactly is WAN side configured on MT. Adding ether1 to WAN interface list might be enough. Adding separate SRC-NAT rule with appropriate "selector" properties (e.g. out-interface=ether1) and "action" (e.g. action=masquerade) is another possibility.

Another possibility would be to add appropriate route on DSL modem ... which might proove as impossible for various reasons (DSL modrm doesn't allow adding custom routes; MT IP address is dynamic and changes from time to time; DSL modem config can't be changed by home owner, etc.).

User fault. I had wrong nat rule. This was used as guide: https://blog.dical.org/how-to-reach-ppp ... -mikrotik/

My oh my.